Reply To: Thin Wall for Multiphase simulation

[Rob]

A thin wall in Fluent is a surface in CAD and Meshing. We just define it as a wall, and Fluent then creates a wall:shadow to account for it having two sides. You can then assign it a material type (metal usually) and a thickness. The thickness is virtual. It's covered to some extent in the User's Guide and likely in the Intro level courses in Learning. 

As there is no thickness there is no mesh inside the wall. However, exercise caution if you use inflation mesh as the "ends" may give a skew cell as the aspect ratio can be high. 

Finally. Running a two domain model in Fluent with multiphase can be problematic. Do you really have multiphase or is it just single phase on each side, ie vapour on tubeside and liquid on shellside?